A test method for tool changing device

Abstract

The present invention discloses a test method for a tool changer, comprising the following steps: step S1: preparation before the test: fixing the equipment, wiring and connecting pipes; step S2: preparing cement: mixing and stirring, and injecting into a water storage tank; step S3: opening the water storage tank inlet ball valve to maintain pressure; step S4: pulling out the knife barrel and closing the valve; step S5: inserting the knife barrel in the tool change state, and the present invention relates to the technical field of a test platform. The high-pressure water is connected through the rear cover ball valve, and the knife barrel is pulled out. At this time, the sealing of the knife barrel and the outer barrel is effective, and it is observed whether there is water seepage or leakage on the valve plate, whether there is water seepage on the packing glands on both sides of the valve, and whether there is water seepage or leakage in other parts of the normal pressure tool changer. If there is no water seepage or leakage, and the pressure gauge indication has no change, the pull-out test is completed, and the whole is used to test the tool changer, with good detection effect, while shortening the test cycle and reducing the test time.

Description

Technical Field

[0001] The invention relates to the technical field of test platforms, and in particular to a tool changing device test method. Background Art

[0002] Traditional shield machines need to have their cutters replaced due to their long working hours during use. The cutter changing device needs to be tested before work to verify whether it meets the usage requirements. This requires the use of a special cutter changing test platform for testing. Summary of the invention

[0003] The present invention provides a tool changing device testing method, which solves the problems raised in the above background technology.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A tool changing device testing method comprises the following steps:

[0006] Step S1: Preparation before the test: Fix the equipment and connect the wiring pipes;

[0007] Step S2: preparing cement: mixing and stirring, and pumping into a water storage tank;

[0008] Step S3: Open the water tank inlet ball valve to maintain pressure;

[0009] Step S4: Pull out the knife barrel and close the valve;

[0010] Step S5: Insert the knife barrel in the knife change state.

[0011] As a further solution of the present invention: the step S1 specifically includes: preparation before the test: ground hardening, arranging and fixing the equipment in order, connecting the pipes, ventilating and checking the sealing conditions of the air compressor-air tank-water tank containers, and judging the existence of leakage points;

[0012] Turn on the power to check the telescopic flexibility of the telescopic cylinder and the valve switch cylinder, and check the working status of the air compressor. The air compressor outlet pressure is preset to 1.15Mpa, the working pressure of the valve switch cylinder is preset to 160Mpa, and the working pressure of the telescopic cylinder is preset to 21Mpa. It should be noted that the normal pressure tool changing device must first pass the preliminary watertight performance verification, including the watertight performance when the knife barrel is inserted and when the knife barrel is pulled out and the valve is closed. The airtight inspection of the water storage tank requires the installation of a baffle on the right flange.

[0013] As a further solution of the present invention: the step S2 specifically includes: water and mud (excluding sand and gravel) are prepared in a mixing box at a ratio of 10:1. After sufficient mixing, they are pumped into a water storage tank through a water pump until the muddy water in the water storage tank emerges, a counter flange is installed at the muddy water inlet, and connected to a compressed air pipeline, and then the top drainage ball valve is closed.

[0014] As a further solution of the present invention: Step S3 specifically includes: opening the water tank inlet ball valve, injecting compressed air until the pressure in the water tank reaches 1.15Mpa, maintaining the pressure for 20 minutes, and observing whether the water tank pressure gauge changes.

[0015] As a further solution of the present invention: the step S4 specifically includes:

[0016] a. Connect the high-pressure water to the rear cover ball valve, flush the inside of the cylinder properly first, then close and remove the water pipe, push the cylinder out to a proper distance, rotate the front clamp of the cylinder, clamp out the rear end of the knife cylinder F block, push the cylinder out, hold the F block, maintain the oil pressure, insert the safety pin, at this time the cylinder push-out stroke is 435mm, remove the connecting bolts of the knife cylinder flange and the outer cylinder flange in turn;

[0017] b. Slowly shrink the oil cylinder to the bottom, and the knife barrel is pulled out. At this time, the seal between the knife barrel and the outer cylinder is effective, and mud and water do not leak out. Connect the water pipe and open the six-way ball valve on the outer cylinder and the valve body, flush appropriately, and then close it. Shrink the valve switch oil cylinder. After the valve is closed, lock the valve with the tightening bolts. Because the knife barrel is pulled out, the pressure in the container is lost, and the air compressor will start to supplement the air pressure to the preset 1.15Mpa. Open the drainage ball valve at the bottom of the outer cylinder of the normal pressure knife changing device to drain the mud and water behind the valve. At this time, the actual distance the knife barrel is pulled out is 435mm;

[0018] c. After the knife cylinder is pulled out, install the knife cylinder bracket at the bottom of the knife cylinder, and assemble the knife cylinder hanger on it, then hook the hanger with a hook, slightly lift the knife cylinder, loosen the safety pin of the front clamping plate of the telescopic oil cylinder, rotate the front clamping plate to separate from the rear end surface of the F block, push out the oil cylinder a little, so that the oil cylinder head goes deep into the groove of the rear cover and matches it, then rotate the front clamping plate and fix it with the safety pin;

[0019] d. Contract the oil cylinder to a stroke of 85mm. The knife barrel is then pulled out again, with a cumulative pull-out of 435+85=520mm. Adjust the height of the knife barrel hoist to make the knife barrel hang in the air. At this point, there is an obvious gap between the knife barrel and the outer barrel, and the seal fails.

[0020] e. Remove the clamp at the rear of the cylinder, remove the safety pin of the telescopic cylinder, rotate the front clamp, detach the telescopic cylinder from the knife barrel at an angle, and pull it to the end together with the hoist and trolley;

[0021] f. Slowly pull out the knife cylinder and move it to the back so that it does not affect the observation of the valve plate sealing condition. Wipe the water on the valve plate with a dry cloth, observe whether there is water seepage or leakage on the valve plate, observe whether there is water seepage from the packing glands on both sides of the valve, observe whether there is water seepage or leakage in other parts of the normal pressure knife changing device, observe whether there is any change in the pressure gauge of the water storage tank, and observe for 15 minutes. If there is no water seepage or leakage and the pressure gauge indication has no change, the pull-out test is over.

[0022] As a further solution of the present invention: the step S5 specifically includes:

[0023] a. Use a manual trolley and hand chain hoist to bring the knife barrel close to the outer barrel of the normal pressure knife changer, raise the knife barrel to a height close to the outer barrel, and manually push the head of the knife barrel into the outer barrel so that the distance from the outer barrel to the knife barrel hanger is less than 95mm. At this time, pay attention to align the bolt hole positions of the knife barrel and outer barrel flanges, install the telescopic oil cylinder and the rear clamp of the oil cylinder, push out the telescopic oil cylinder so that the head of the oil cylinder goes deep into the groove of the rear cover, rotate the front clamp, and install the safety pin;

[0024] b. Open a ball valve on the top of the knife barrel, push out the oil cylinder, and push the knife barrel forward. When the distance between the outer barrel and the knife barrel hanger is 5mm, stop pushing. At this time, the seal between the knife barrel and the outer barrel takes effect;

[0025] c. Connect the water supply pipe to the drainage ball valve at the bottom of the knife barrel and supply water until water comes out from the top ball valve. At this time, close the bottom ball valve and the top ball valve, and remove the knife barrel hanger and knife barrel bracket;

[0026] d. Loosen the tightening bolts on the valve, open the valve switch cylinder, open the valve, and after the mud and water are mixed before and after the valve, the compressor works to add pressure to 1.15Mpa, push out the telescopic cylinder, until the flange surface of the knife cylinder contacts the flange surface of the outer cylinder, and the cylinder maintains pressure;

[0027] It should be noted that before the knife barrel enters the outer barrel, the bolt holes of the two flanges should be aligned so that the knife barrel flange can smoothly pass through the positioning pin on the outer barrel flange, and finally install the flange connection bolts. Due to the insertion of the knife barrel, the pressure in the water storage tank will increase to about 1.2Mpa;

[0028] e. The above knife barrel reinstallation has been completed. Maintain the pressure and observe for 15 minutes to check whether the system is leaking. When the knife barrel needs to be pulled out, loosen the telescopic cylinder clamp and transfer the cylinder clamp to the rear section of block F.

[0029] The present invention provides a tool changing device test method. Compared with the prior art, it has the following beneficial effects:

[0030] By connecting the rear cover ball valve to high-pressure water, the knife cylinder is pulled out. At this time, the seal between the knife cylinder and the outer cylinder is effective. Observe whether there is water seepage or leakage on the valve plate, observe whether there is water seepage from the packing glands on both sides of the valve, and observe whether there is water seepage or leakage in other parts of the normal pressure tool changing device. If there is no water seepage or leakage and the pressure gauge indication has no change, the pull-out test is completed. The whole device is used to test the tool changing device with good detection effect. At the same time, the test cycle is shortened and the test time is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0032] Figure 1 It is a schematic diagram of the structure of the present invention.

[0033] In the figure: 1. Air compressor; 2. Air storage tank; 3. Water storage tank; 5. Normal pressure tool changing device; 6. Telescopic cylinder; 7. Liquid pump station; 8. Valve switch cylinder; 9. Mixing box; 10. Water pump; 11. Support bracket. DETAILED DESCRIPTION

[0034] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0035] See also Figure 1 As shown, a tool changing device test method comprises the following steps:

[0036] Step S1 includes: preparation before the test: ground hardening, arranging and fixing the equipment in order, connecting and connecting the pipes, ventilating and checking the sealing conditions of the air compressor 1 - air storage tank 2 - water storage tank 3 containers, and judging the existence of leakage points;

[0037] Turn on the power to check the telescopic flexibility of the telescopic cylinder 6 and the valve switch cylinder 8, and check the working status of the air compressor 1. The outlet pressure of the air compressor 1 is preset to 1.15Mpa, the working pressure of the valve switch cylinder 8 is preset to 160Mpa, and the working pressure of the telescopic cylinder 6 is preset to 21Mpa. It should be noted that the normal pressure tool changing device 5 must first pass the preliminary watertight performance verification, including the watertight performance when the knife barrel is inserted and when the knife barrel is pulled out and the valve is closed. The airtight inspection of the water storage tank 3 requires the installation of a blind plate on the right flange.

[0038] Step S2 includes: water and mud (without sand and gravel) are prepared in a mixing box 9 at a ratio of 10:1. After sufficient mixing, they are pumped into the water storage tank 3 through a water pump 10 until about 2 cubic meters of mud water in the water storage tank 3 emerges. A counter flange is installed at the mud water inlet and connected to a compressed air pipeline, and then the top drainage ball valve is closed.

[0039] Step S3 includes: opening the inlet ball valve of the water storage tank 3, injecting compressed air until the pressure in the water storage tank 3 reaches 1.15Mpa, maintaining the pressure for 20 minutes, and observing whether the pressure gauge of the water storage tank 3 changes.

[0040] Step S4 includes:

[0041] a. Connect the high-pressure water to the rear cover ball valve, flush the inside of the cylinder properly first, then close and remove the water pipe, push the cylinder out to a proper distance, rotate the front clamp of the cylinder, clamp out the rear end of the knife cylinder F block, push the cylinder out, hold the F block, maintain the oil pressure, insert the safety pin, at this time the cylinder push-out stroke is 435mm, remove the connecting bolts of the knife cylinder flange and the outer cylinder flange in turn;

[0042] b. Slowly shrink the oil cylinder to the bottom, and the knife barrel is pulled out. At this time, the seal between the knife barrel and the outer cylinder is effective, and muddy water does not leak out. Connect the water pipe and open the six-way ball valve on the outer cylinder and the valve body, flush appropriately, and then close it. Shrink the valve switch oil cylinder 8. After the valve is closed, lock the valve with the top bolt. Because the knife barrel is pulled out, the pressure in the container is lost, and the air compressor 1 will start to supplement the air pressure to the preset 1.15Mpa. Open the drainage ball valve at the bottom of the outer cylinder of the normal pressure knife changing device 5 to drain the muddy water behind the valve. At this time, the actual distance of the knife barrel being pulled out is 435mm;

[0043] c. After the knife cylinder is pulled out, install the knife cylinder bracket at the bottom of the knife cylinder, and assemble the knife cylinder hanger on it, then hook the hanger with a hook, slightly lift the knife cylinder, loosen the safety pin of the front clamp of the telescopic oil cylinder 6, rotate the front clamp to detach from the rear end face of the F block, push out the oil cylinder a little, so that the oil cylinder head goes deep into the groove of the rear cover and matches it, then rotate the front clamp and fix it with the safety pin;

[0044] d. Contract the oil cylinder to a stroke of 85mm. The knife barrel is then pulled out again, with a cumulative pull-out of 435+85=520mm. Adjust the height of the knife barrel hoist to make the knife barrel hang in the air. At this point, there is an obvious gap between the knife barrel and the outer barrel, and the seal fails.

[0045] e. Remove the clamp at the rear of the cylinder, remove the safety pin of the telescopic cylinder 6, rotate the front clamp, and detach the telescopic cylinder 6 from the knife barrel at an angle, and pull it to the end together with the hoist and trolley;

[0046] f. Slowly pull out the knife cylinder and move it to the back so that it does not affect the observation of the valve plate sealing condition. Wipe the water on the valve plate with a dry cloth, observe whether there is water seepage or leakage on the valve plate, observe whether there is water seepage from the packing glands on both sides of the valve, observe whether there is water seepage or leakage from other parts of the normal pressure knife changing device 5, observe whether there is any change in the pressure gauge of the water storage tank 3, and observe for 15 minutes. If there is no water seepage or leakage and the pressure gauge indication has no change, the pull-out test is over.

[0047] Step S5 includes:

[0048] a. Use a manual trolley and hand chain hoist to bring the knife barrel close to the outer barrel of the normal pressure knife changer, raise the knife barrel to a height close to the outer barrel, and manually push the head of the knife barrel into the outer barrel so that the distance from the outer barrel to the knife barrel hanger is less than 95mm. At this time, pay attention to aligning the bolt hole positions of the knife barrel and outer barrel flanges, install the telescopic oil cylinder 6 and the rear clamp of the oil cylinder, push out the telescopic oil cylinder 6, so that the head of the oil cylinder goes deep into the groove of the rear cover, rotate the front clamp, and install the safety pin;

[0049] b. Open a ball valve on the top of the knife barrel, push out the oil cylinder, and push the knife barrel forward. When the distance between the outer barrel and the knife barrel hanger is 5mm, stop pushing. At this time, the seal between the knife barrel and the outer barrel takes effect;

[0050] c. Connect the water supply pipe to the drainage ball valve at the bottom of the knife barrel and supply water until water comes out from the top ball valve. At this time, close the bottom ball valve and the top ball valve, and remove the knife barrel hanger and knife barrel bracket;

[0051] d. Loosen the tightening bolts on the valve, open the valve switch cylinder 8, open the valve, and after the mud and water are mixed before and after the valve, the compressor works to add pressure to 1.15Mpa, push out the telescopic cylinder 6, until the flange surface of the knife cylinder contacts the flange surface of the outer cylinder, and the cylinder maintains pressure;

[0052] It should be noted that before the knife barrel enters the outer barrel, the bolt holes of the two flanges should be aligned so that the knife barrel flange can smoothly pass through the positioning pin on the outer barrel flange, and finally install the flange connection bolts. Due to the insertion of the knife barrel, the pressure in the water storage tank will increase to about 1.2Mpa;

[0053] e. The above knife barrel reinstallation has been completed. Maintain the pressure and observe for 15 minutes to check whether the system is leaking. When the knife barrel needs to be pulled out, loosen the telescopic cylinder clamp and transfer the cylinder clamp to the rear section of block F.

[0054] Since the test requires many times of pulling out and inserting, it would be very time-consuming if the knife barrel is completely pulled out and then inserted every time. The maximum number of knife changes is only related to the three seals, and the wear of these three seals has nothing to do with the pulling out and inserting of the knife barrel, but only with the number of times the valve is opened and closed. Therefore, the following test method is to pull out the knife barrel about 435mm, open and close the valve several times (tentatively 20 times), and then pull out the knife barrel completely according to the above procedure, and observe the water seepage and leakage of each part when the valve is closed.

[0055] With 20 valve openings and closings as one cycle, after pulling out the knife barrel, observe the sealing conditions of the valve and other leak-prone points and record them. Then, insert the barrel again to start the second cycle of testing. After multiple cycles, there is obvious leakage at the valve, and the seal is judged to have failed. At the same time, the maximum number of knife changes, that is, the service life of the normal pressure knife changing device 5, is also determined. It should be noted that if leakage occurs at the replaceable seal during the test, it should be replaced and then the test should be continued without affecting the test results.

[0056] The purpose of the limit life test is to observe the number of times the three non-replaceable seals are used. During each test cycle, the valve can be opened and closed without fully inserting the knife barrel, so some operations can be omitted.

[0057] Among them, the whole includes an air compressor 1, the air compressor 1 is connected to the air tank 2, the mixing box 9 is connected to the water pump 10, the whole device is arranged on a support bracket 11, and the water tank 3 is connected to the air tank 2 and the water pump 10, and the liquid pump station 7 provides oil pressure output between the valve switch cylinder 8 and the telescopic cylinder 6.

[0058] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A tool changing device test method, Features: The steps include: Step S1: Preparation before the test: Fix the equipment and connect the wiring pipes; Step S2: preparing cement: mixing and stirring, and pumping into a water storage tank (3); Step S3: Open the inlet ball valve of the water storage tank (3) to maintain pressure; Step S4: Pull out the knife barrel and close the valve; Step S5: insert the knife barrel in the knife change state; Step S4 specifically includes: a. Connect the high-pressure water to the rear cover ball valve, flush the inside of the cylinder first, then close and remove the water pipe, push the cylinder out to the set distance, rotate the front clamp of the cylinder, clamp out the rear end of the knife cylinder F block, push the cylinder out, hold the F block, maintain the oil pressure, insert the safety pin, at this time the cylinder push-out stroke is 435mm, remove the connecting bolts of the knife cylinder flange and the outer cylinder flange in turn; b. Slowly retract the oil cylinder to the bottom, and the knife barrel is pulled out. At this time, the seal between the knife barrel and the outer cylinder is effective, and mud and water do not leak out. Connect the water pipe and open the six-way ball valve on the outer cylinder and the valve body for flushing, and then close it. Retract the valve switch oil cylinder (8). After the valve is closed, lock the valve with the tightening bolt. Because the knife barrel is pulled out, the pressure in the container is lost. The air compressor (1) will start to replenish the air pressure to the preset 1.15Mpa. Open the drainage ball valve at the bottom of the outer cylinder of the normal pressure knife changing device (5) to drain the mud and water behind the valve. At this time, the actual distance the knife barrel is pulled out is 435mm; c. After the knife cylinder is pulled out, install the knife cylinder bracket at the bottom of the knife cylinder, and assemble the knife cylinder hanger on it, then hook the hanger with a hook, lift the knife cylinder, loosen the safety pin of the front clamping plate of the telescopic oil cylinder (6), rotate the front clamping plate to separate from the rear end surface of the F block, push out the oil cylinder, make the oil cylinder head go deep into the groove of the rear cover and match it, then rotate the front clamping plate and fix it with the safety pin; d. Contract the oil cylinder. At this time, the knife barrel is pulled out again. Adjust the height of the knife barrel hoist so that the knife barrel is suspended in the air. At this time, there is a gap between the knife barrel and the outer barrel, and the seal fails. e. Remove the clamp at the rear of the cylinder, remove the safety pin of the telescopic cylinder (6), rotate the front card plate, and detach the telescopic cylinder (6) from the knife cylinder at an angle, and pull it together with the hoist and the trolley to the end; f. Pull out the knife barrel slowly and move it to the rear so that it does not affect the observation of the valve plate sealing condition. Wipe the water on the valve plate with a dry cloth and observe whether there is water seepage or leakage on the valve plate. Observe whether there is water seepage or leakage on the packing glands on both sides of the valve. Observe whether there is water seepage or leakage in other parts of the normal pressure knife changing device (5). Observe whether there is any change in the pressure gauge of the water storage tank (3). Observe for 15 minutes. If there is no water seepage or leakage and the pressure gauge indication has no change, the pull-out test is over. Step S5 specifically includes: a. Use a manual trolley and hand chain hoist to bring the knife barrel close to the outer barrel of the normal pressure knife changer, raise the knife barrel to a height close to the outer barrel, and manually push the head of the knife barrel into the outer barrel so that the distance from the outer barrel to the knife barrel hanger is less than 95 mm. Install the telescopic oil cylinder (6) and the clamp at the rear of the oil cylinder, push out the telescopic oil cylinder (6) so that the head of the oil cylinder is deeply embedded in the groove of the rear cover, rotate the front clamp, and install the safety pin; b. Open a ball valve on the top of the knife barrel, push out the oil cylinder, and push the knife barrel forward. When the distance between the outer barrel and the knife barrel hanger is 5mm, stop pushing. At this time, the seal between the knife barrel and the outer barrel takes effect; c. Connect the water supply pipe to the drainage ball valve at the bottom of the knife barrel and supply water until water comes out from the top ball valve. At this time, close the bottom ball valve and the top ball valve, and remove the knife barrel hanger and knife barrel bracket; d. Loosen the tightening bolts on the valve, open the valve switch cylinder (8), open the valve, and after the mud and water are mixed before and after the valve, the compressor works to add pressure to 1.15Mpa, push out the telescopic cylinder (6), until the flange surface of the knife cylinder contacts the flange surface of the outer cylinder, and the cylinder maintains pressure; e. The above knife barrel reinstallation has been completed. Maintain the pressure and observe for 15 minutes to check whether the system is leaking. When the knife barrel needs to be pulled out, loosen the cylinder clamp and transfer the cylinder clamp to the rear section of block F.

2. A tool changing device testing method according to claim 1, Features: Step S1 specifically includes: preparation before the test: ground hardening, arranging and fixing the equipment in order, connecting the wiring pipes, ventilating and checking the sealing conditions of the air compressor (1) - air storage tank (2) - water storage tank (3) containers, and determining the existence of leakage points; Power on to check the telescopic flexibility of the telescopic oil cylinder (6) and the valve switch oil cylinder (8), and check the working status of the air compressor (1).

3. A tool changing device testing method according to claim 1, Features: Step S2 specifically includes: water and mud are prepared in a mixing box (9) at a ratio of 10:1, and after being fully mixed, they are pumped into a water storage tank (3) through a water pump (10) until the muddy water in the water storage tank (3) emerges, a counter flange is installed at the muddy water inlet, and connected to a compressed air pipeline, and then the top drainage ball valve is closed.

4. A tool changing device testing method according to claim 1, Features: Step S3 specifically includes: opening the inlet ball valve of the water storage tank (3), injecting compressed air until the pressure in the water storage tank (3) reaches 1.15Mpa, maintaining the pressure for 20 minutes, and observing whether the pressure gauge of the water storage tank (3) changes.

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